> Half of that $50B goes into "selling, general, and administrative" salaries
And a lot of this overhead cost isn't necessary simply because the system is so horribly broken. And not just on the side of insurance expenses, but also on the benefits payout side. The US system has consistently shown to be more expensive for worse outcomes than other nations' systems.
> To get prices of housing/healthcare/education/childcare down to reasonable levels, you need to invent ways [...]
No you Americans don't need to invent anything new. Americans should just go and look how other countries operate, the typical American Exceptionalism attitude of "no one does anything better than the US" is the biggest problem the country has.
Housing cost is inflated because rural areas are getting depopulated because of rotting infrastructure (e.g. broadband Internet, adequately funded schools, public transport, access to healthcare) and because employers for modern jobs are located in urban areas. Fixing that requires investment in mentioned infrastructure and incentives for companies to provide remote work for people living outside of urban areas. In some areas, foreign dark money and speculation (cough AirBnB) add to the mix, the former can be confiscated (which the US is beginning to do, at least against Russian assets) and the latter banned or at least severely taxed.
Healthcare costs can be fixed by literally copying any of the other Western nations' healthcare model, and by providing access to more MD education to fix the supply side of doctors.
Education costs aren't that inflated (actually, they are often enough so horribly underfunded that schools only run for four days so teachers can go and run side gigs, or teachers having to pay for supplies out of their already poor wages), but if cost savings were to be made there, I'd start with professional school sports teams and by providing food not out of school budgets but out of social services budgets.
Childcare costs... well, there's supply and demand right there. When both parents have to work two or more jobs to barely make rent, they need childcare. A decent minimum wage that provides enough for a single income to live a decent life should fix the demand and knock out a whole lot of other poverty-related side effects in the process.